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    Modeling Study of Variable Upwelling Circulation in the East China Sea: Response to a Coastal Promontory

    Source: Journal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 004::page 1078
    Author:
    Liu, Zhiqiang
    ,
    Gan, Jianping
    DOI: 10.1175/JPO-D-13-0170.1
    Publisher: American Meteorological Society
    Abstract: three-dimensional, high-resolution numerical model is used to investigate processes and dynamics of an intensified upwelling that is induced by a coastal promontory over the East China Sea (ECS) shelf. The center of the intensified upwelling around the promontory has been constantly observed, but, so far, it has been dynamically unexplained. Forced by an idealized southeasterly wind stress, the model results well capture the observed upwelling at the lee of the coastal promontory. The intensified upwelling is formed by a strengthened shoreward transport downstream of the promontory as the upwelling jet veers shoreward. The jet is mainly controlled by a cross-shore geostrophic balance and is largely modulated by both centrifugal acceleration associated with nonlinear advection and by bottom stress. The strengthened shoreward transport is mainly attributed to the cross-shore geostrophic current that is induced by a countercurrent (negative) pressure gradient force (PGF) and partly attributed to the bottom Ekman transport. Based on the analyses of the momentum balance and depth-integrated vorticity dynamics, the authors provide a new explanation for the origin of negative PGF. It is found that the countercurrent PGF is generated by negative bottom stress curl and strengthened by negative vorticity advection downstream of the promontory. While the negative bottom stress curl arises from bottom shear vorticity, the source of negative advection downstream of the promontory is the negative shear vorticity on the seaside of the shoreward-bent jet. Nevertheless, cyclonic curvature vorticity at the bottom and positive vorticity advection in the water column at the promontory weakens the negative PGF. Although nonlinear advection strengthens vorticity advection, it weakens bottom stress curl and has little net effect on the countercurrent PGF.
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      Modeling Study of Variable Upwelling Circulation in the East China Sea: Response to a Coastal Promontory

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4226607
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    contributor authorLiu, Zhiqiang
    contributor authorGan, Jianping
    date accessioned2017-06-09T17:20:09Z
    date available2017-06-09T17:20:09Z
    date copyright2014/04/01
    date issued2014
    identifier issn0022-3670
    identifier otherams-83388.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4226607
    description abstractthree-dimensional, high-resolution numerical model is used to investigate processes and dynamics of an intensified upwelling that is induced by a coastal promontory over the East China Sea (ECS) shelf. The center of the intensified upwelling around the promontory has been constantly observed, but, so far, it has been dynamically unexplained. Forced by an idealized southeasterly wind stress, the model results well capture the observed upwelling at the lee of the coastal promontory. The intensified upwelling is formed by a strengthened shoreward transport downstream of the promontory as the upwelling jet veers shoreward. The jet is mainly controlled by a cross-shore geostrophic balance and is largely modulated by both centrifugal acceleration associated with nonlinear advection and by bottom stress. The strengthened shoreward transport is mainly attributed to the cross-shore geostrophic current that is induced by a countercurrent (negative) pressure gradient force (PGF) and partly attributed to the bottom Ekman transport. Based on the analyses of the momentum balance and depth-integrated vorticity dynamics, the authors provide a new explanation for the origin of negative PGF. It is found that the countercurrent PGF is generated by negative bottom stress curl and strengthened by negative vorticity advection downstream of the promontory. While the negative bottom stress curl arises from bottom shear vorticity, the source of negative advection downstream of the promontory is the negative shear vorticity on the seaside of the shoreward-bent jet. Nevertheless, cyclonic curvature vorticity at the bottom and positive vorticity advection in the water column at the promontory weakens the negative PGF. Although nonlinear advection strengthens vorticity advection, it weakens bottom stress curl and has little net effect on the countercurrent PGF.
    publisherAmerican Meteorological Society
    titleModeling Study of Variable Upwelling Circulation in the East China Sea: Response to a Coastal Promontory
    typeJournal Paper
    journal volume44
    journal issue4
    journal titleJournal of Physical Oceanography
    identifier doi10.1175/JPO-D-13-0170.1
    journal fristpage1078
    journal lastpage1094
    treeJournal of Physical Oceanography:;2014:;Volume( 044 ):;issue: 004
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian